Gear blank



Patented sept. t4, :ai

Hannan. Banni/ran ANDARTHURJ. ensrrnn, or vvrnnrnsnniae, rmvnsvnvanrm i ASSIGNORS TO WESTINGHO'USE ELECTRIC ANI) CORPORATION F PENNSYLVANIA.

MANUFACTURING COMPANY, A

'enan enana. 'i

Application filed September t28, 1923. Serial No. 665,374.

shall be economical to manufacture with a 1 minimum amount of Waste material resulting therefrom, which shall 'be readily adapted to manufacture in relatively large quantities With uniform results and which shall be mechanically durable andefficient as a gear element when embodied in ma.-

chine tools7 enginesk or the like.

metallic rim ortion of fibrous material and a hardened binder mounted or molded-on a metal center or hub support as heretofore manufactured, Were formed of a plurality of superposed layerscof fibrous sheetmaterial such as duck, Which is a heavy Woven textile fabric, or paper Which was suitably treated by impregnating with a binder-such as a phenolic condensation product and assembled in segment or ring form about a metal center or" hub in the matrix of a suitable mold. The necessity for punching segments and rings resulting inNj a considerable amount of scrap material averaging appror'imately 30% 'of the total material utilized in the gear Wheel. Another more recent development consisted of Winding a."

continuous strip of fibrous material edge- Wise about the periphery of the hub member gear element and the outer periphery of the supporting hub member.

Our present invention is .directed to a` c Composite gear Wheels comprising a nonsuch strip being out or notched to provide the proper curvature due to th'e variation in the lengths of the outer periphery'of thel operation. We further propose employing a double strip which facilitates the notching operation and the assembling or Windingof the strip on the hub.

In the accompanying drawings constii tuting a part hereof and in Which likereference characters designate like parts Fig. l is an elevational view of a gear Wheel embodying the principles of our invention,

2 is an elevational view of a strip of fibrous material notched and partially doubled which isemployed inthe gear Wheel illustrated in Fig. l,

Fig. 3 is a plan View of a notched strip split at one end and Fig. 4 is a plan view ofa single strip adaptedto be `Wound aroundy a hub member as illustrated in F ig. l.

With a central extending huh portion 3, a

Web portion thavingopenings therein for Referring to Fig. 1, va composite gear the purpose oflightening the structure and an outer rim 6 provided With a knurled periphery 7, the knurl being preferably of Aa suitable binder such as a phenolic con? densation product thereon. i

.. Wepreferfto utilize a strip 9, lFig. It, havi ing il-shape notches l() thereinl vvhichextend 1 froml one edgefof the stri-p transversely across leavir'igv just sutiicient rmaterial between the bottom of their' andthe edge of the` body portion tov facilitate handling the material for winding it around the hub 1.

The' strip-"9 is Wound varound the outer` the strip toprovide suhcient strength of I periphery of the hub l with the notched edge adjacent to the knurl vto form a continuous helix of superposed'layers. After Winding the strips on the hub the edges of the notches lO'are in contact', thus compensating for the dierence in the diametersv of the periphery of the hub 1 and the outer edge of the Wound strip The assembled structure is then placed in a suitable mold and subjected to heat and pressure to'compact the fibrous material and to consolidate the mass, thereby forming a. non-metallic rim portion 8 as .an integral part of the hub 1. -f

Inplaceof the strip 9, Figa, we may,

ntilizeia wider strip l1, Figs. 2 and 3 and by forming y substantially diamond-'shape notches 12 centrally thereintthe4 strip may be folded upon itself to form a double strip portion 13, Fig. 2, which may be wound on a hub member similarly to the strip 9 with a wideportion of the notch adjacent to Athe lrnurl 7. V*If for any reason it is desirable to utilize a single strip 9, it is possible to employ a wide strip 11 having diamondshape notches 12 therein, folding the strip and splitting the same along its longitudinal center 14, as it is being wound on the hub. This splitting may beaccomplished in vari-l ous ways, as by a single knife-edge provided in theguide which may be in proximity to the hub member as the strip is wound there' on, or a circularknifecuttermay be einployed. y .u

It is 4evidentfrom the above description of our invention that gear wheels formed in accordance therewith are of uniform density and of a homogeneous structure through out-the non-metallic body portion, and' that the process employed for forming the same is 'adapted to facilitate production and to minimize the Waste. The notchingfof the strip material may be accomplished in varous ways as by punching dies or` rotary cutf ters and this operation may be made' a part of the winding operation as the strip may be passed through such dies or cutters as it is being wound on the hub.

Although we have described a specific embodiment of our invention, it will be obvious to those skilled in the art that various modifications may be made in the details of construction without departing from the p'rinciples herein set forth. i For instance, the notches in thestrip may be of any suitable proportions relative to the width of such strip and the density and texture thereof and the angular spacing of the notches may be varied with varying diameters of the hub member'so as to entirely eliminate buckling or crimping .of the fibrous material.

We claim as our invention 1. A composite article comprising a metal hub and a non-metallic rim, said rim comprising a helical strip of fibrous sheet material folded at its center and notched onthe folded edge which is disposed adjacent the hub and consolidated with a binder.

2. A composite article comprising a metal hub and a non-metallic rim, said rim comprising a helical strip .of fibrous sheet material folded at its center and provided with substantially V-shaped notches and consolidated with a binder.

B. A compositefa'rticle comprising a metal. hub and a non-metallic rim, said rim comprising a helical strip of fibrous sheet Inaterial folded at its center and notched on the folded side vonly and consolidated with a binder. A

4. A composite article comprising a metal hub and ay non-metallic rim, said rim Comprising` a folded strip of fibrous sheet material in the form of an endless helix having y notchesextending transversely thereof and substantially across its entire face on. its folded side only, said rim being consolidated with a hardened binder.k

5. A composite article comprising a metal hub and a non-metallic rim, said rim comprisingva helix of fibrous sheet material in the forni. of an endless strip, said strip hav` ing diamond-shaped openings extendipg transversely Vthereof and folded lengthwise to provide/all folded edge having Vf-'shape notches vwhich are'disposed adjacent'tofthe hub, saidy rim being consolidated with La hardened binder.

In testimony whereof, we have hereunto subscribed our names this 25th day of September, 1923.

HARRY o. Rin-RMAR. I

ARTHUR J. BASTlAN. 

